CLOCKS_PER_SEC

From Cppreference

C++ Standard Library
Language Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
Utilities library
Date and time utilities
time_point (C++11) duration (C++11) system_clock (C++11) steady_clock (C++11) high_resolution_clock (C++11) C library facilities
C-style date and time utilities
Functions Time manipulation difftime time clock Format conversions asctime ctime strftime gmtime localtime mktime Constants CLOCKS_PER_SEC Types tm time_t

Defined in header <ctime>
#DEFINE CLOCKS_PER_SEC /*implementation defined*/

Defines number of clock ticks per second, as returned by clock().

[edit] See also

clock	returns raw processor clock time since the program is started (function)